Wizzair currently have a sale on flights to/from poland, says Â£19.99 each way inc taxes, but mine came out even cheaper. Just booked Liverpool and Warsaw (return) Friday-Monday at end of Feb, Â£32.36 ! (Inc taxes and booking fees etc!)
Cheaper than a Taxi in/out of town for a night out!
They fly from many UK airports, mainly to Poland, but also Romania and Hungary.